Air humidifier



FIG. 1 is a front and top perspective view of an air humidifier, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a rear elevation view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the figures illustrate portions of the air humidifier that form no part of the claimed design. 

CLAIM The ornamental design for an air humidifier, as shown and described. 